package com.itcam.otcbackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itcam.otcbackend.auth.StpKit;
import com.itcam.otcbackend.enums.ErrorCode;
import com.itcam.otcbackend.enums.UserRoleEnum;
import com.itcam.otcbackend.exception.BusinessException;
import com.itcam.otcbackend.model.po.User;
import com.itcam.otcbackend.mapper.UserMapper;
import com.itcam.otcbackend.model.dto.user.UserQueryRequest;
import com.itcam.otcbackend.model.vo.LoginUserVO;
import com.itcam.otcbackend.model.vo.UserVO;
import com.itcam.otcbackend.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;

import static com.itcam.otcbackend.constant.UserConstant.USER_LOGIN_STATE;

/**
 * @author Cammy
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-02-17 05:11:39
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
        implements UserService {

    /**
     * 用户注册
     * @param userAccount   用户账户
     * @param userPassword  用户密码
     * @param checkPassword 校验密码
     * @return
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1.校验
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        // 2. 检查是否重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        long count = this.baseMapper.selectCount(queryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        // 3. 加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 4. 插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName(generateRandomUserName());
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if (!saveResult) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
        }
        return user.getId();
    }

    /**
     * 用户登录
     * @param userAccount
     * @param userPassword
     * @param request
     * @return
     */
    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 校验
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号错误");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
        }
        // 2.加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 查询用户是否存在
        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<User>()
                .eq(User::getUserAccount, userAccount)
                .eq(User::getUserPassword, encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        // 用户不存在
        if (user == null) {
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }
        // 3.记录用户的登录状态
        request.getSession().setAttribute(USER_LOGIN_STATE, user);

        // 4.记录用户登录态到 Sa-Token，便于空间鉴权时使用，注意保证该用户信息与SpringSession中的信息过期时间一致
        StpKit.SPACE.login(user.getId());
        StpKit.SPACE.getSession().set(USER_LOGIN_STATE, user);

        return this.getLoginUserVO(user);
    }

    /**
     * 获取脱敏类的用户信息
     *
     * @param user 用户
     * @return 脱敏后的用户信息
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        // 检查传入的用户对象是否为空，若为空则直接返回 null
        if (null == user) {
            return null;
        }
        // 创建一个新的 LoginUserVO 对象，用于存储脱敏后的用户信息
        LoginUserVO loginUserVO = new LoginUserVO();
        // 使用 BeanUtil.copyProperties 方法将用户对象的属性复制到 LoginUserVO 对象中
        BeanUtil.copyProperties(user, loginUserVO);
        // 返回脱敏后的用户信息对象
        return loginUserVO;
    }

    /**
     * 获取当前用户登录
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 1.先判断是否已登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (null == currentUser || null == currentUser.getId()) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 2.从数据库查询
        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (null == currentUser) {
            throw new BusinessException(ErrorCode.NOT_FOUND_ERROR);
        }
        return currentUser;
    }

    /**
     * 用户退出
     * @param request
     * @return
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        // 1.先判断是否已登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        if (null == userObj) {
            throw new BusinessException(ErrorCode.NOT_FOUND_ERROR, "未登录");
        }
        // 移除登录态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    /**
     * 获取当个脱敏用户
     * @param user
     * @return
     */
    @Override
    public UserVO getUserVo(User user) {
        if (null == user) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 获取脱敏用户列表
     * @param userList
     * @return
     */
    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream()
                .map(this::getUserVo)
                .collect(Collectors.toList());
    }

    /**
     * 将查询请求转为QueryWrapper对象
     * @param userQueryRequest
     * @return
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (null == userQueryRequest) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userRole = userQueryRequest.getUserRole();
        String userProfile = userQueryRequest.getUserProfile();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<User>()
                .eq(ObjUtil.isNotNull(id), "id", id)
                .eq(ObjUtil.isNotNull(userRole), "userRole", userRole)
                .like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount)
                .like(StrUtil.isNotBlank(userName), "userName", userProfile)
                .like(StrUtil.isNotBlank(userProfile), "userProfile", userAccount)
                .orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }


    /**
     * 对用户密码进行加密处理
     *
     * @param userPassword 原始用户密码
     * @return 加密后的密码字符串
     */
    @Override
    public String getEncryptPassword(String userPassword) {
        // 定义盐值，用于增加密码加密的复杂度，防止彩虹表攻击
        final String salt = "faction";
        // 将盐值和用户密码拼接后，转换为字节数组，使用 MD5 算法进行加密，并将加密结果转换为十六进制字符串返回
        return DigestUtils.md5DigestAsHex((salt + userPassword).getBytes());
    }

    /**
     * 是否为管理员
     * @param user
     * @return
     */
    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

    /**
     * todo
     * @param user
     * @return
     */
    @Override
    public UserVO getUserVO(User user) {
        return null;
    }

    /**
     * 生成搞怪随机用户名，格式为 动漫角色名+搞怪动作
     * @return 搞怪随机用户名
     */
    public String generateRandomUserName() {
        List<String> animeCharacters = List.of("路飞", "鸣人", "柯南", "小樱", "哆啦A梦", "皮卡丘");
        List<String> funnyActions = List.of("跳霹雳舞", "吃臭豆腐", "扮鬼脸", "睡大觉", "玩泥巴", "学狗叫");

        Random random = new Random();
        String character = animeCharacters.get(random.nextInt(animeCharacters.size()));
        String action = funnyActions.get(random.nextInt(funnyActions.size()));

        return character + action;
    }

}



